Power take-off attachment



June 16, 1942. l-LAQHUTCHINS ,2

I v I POWER TAKE-OFF ATTACHMENT Filed Feb. 21, 1959 2 Sheets-Sheet 1June 16, 194-120 H. A. Hu-rcHiNs I POWER TAKE-OFF ATTACHMENT Filed Feb;21, 1939 2 Sheets-Sheet 2 or vehicle.

Patented June is, 1942.

UNITED STATES PATENT OFFICE rowan TAKE-l) mime Hugh Allen Hntchins, LosAngeles, Calif. I Application February 21, 1939, Serial No. 251.671

(01. zsa-isi) 8 Claims.

ment to be applied to a tractor, or the like, to

control and operate various devices and implements drawn by orassociated with the tractor A general object of this invention is toprovide a practical, eflective power take-off The device of the presentinvention is suitable for use on both types of tractors withoutmodification or alteration.

Another object of this invention is to provide a power take-offattachment embodying novel means for controlling the clutches of thedrums which means require a minimum of manual exertion and a shortmanual stroke for their opera- 7 tion. Another object of this inventionis to provide a power take-off attachment of the character if mentioned,in which the clutch means are parout which description reference is madeto theaccompanving. drawings, in which:

Fig. 1 is, a side'elevation of the improved attachment f the presentinvention in position on a typical tractor showing the tractor in Ibroken lines. Fig. 2 isan enlarged front view of the attachment with theadapter and drive shaft in vertical cross section, being a view takensubstantially as indicated byline 2,-2 on Fig. 1.' Fig. 3 is an enlargedvertical detailed sectional view taken as indicated by line 3-3, on Fig.2

showing the clutch in a released condition. Fig. 3

4 is an enlarged fragmentary horizontal detailed ing of the attachmentandthe adjacent parts.

Fig. 5 is a reduced fragmentary rear elevation taken substantially asindicated by line 5-5 on Fig. 3, and Fig. 6 is a vertical detailedsectional view' of a portion of one of the line-handling means, being aview taken substantially as indicatedby line 68 on Fig.2.

tially self-energized, that is, the'appli'ed power from the drive shaftassists in engaging the clutches. 7 Another object of this invention isto provide a power-take-ofl. attachment embodying novel simplifiedbearing means for the drum driving shafts and for the principal gears.-

Another object of this invention is to provide a power take-offattachment of the. character referred to in which the clutches andbrakes are ited or restricted to the specific form of the arranged to beimmediately accessible and easily removal and repair without disturbingthe drums,

the'controls, or the other parts of-the-zmechanism.

A further objectof this invention is to pro- .vide a power take-ofiattachment of the character referred to embodying novel means for han-The power take-oil attachment of the pres- V out invention is adapted tobe applied to tractors and other power driven vehicles of various-makes, types, etc. and may be employed to control or operate grading,excavating, and road building machines and implements of differentkinds. In the following detailed description! will describe a typicalpreferred form of the invention applied to a more or less conventional 1drawn by the tractor. It is to be understood that the invention is notto be construed as 11::- v'ention herein described.

, The power take-oil attachment of the present V invention may be saidto comprise. generally,

a housing In, adjustable means 'II for mountingthe housing It on thetractor T, a pair of spaced.

line winding drums l2 rotatably mounted on the housing Ill, drive meansIt in the housing It for rotating the drums l2, clutch and brake meansll for controlling the drums l2, and means I.

for handling the lines L extending from the drums l2.

The housing .III is provided to carry and housethe various operatingparts of the mechanism. dling and directing the lines leaving the drumsIn the preferred construction illustrated the housing I includes a bodyas and a plate n closing the rear side of the body It. A generallyhorizontal mounting plate i3 is suitably secured to the upper side ofthe housing body I5 to carry the means l5 and other parts. Sets or pairsof aligned horizontal openings I9 and 20 are provided in the forwardwall of the body l5 and the housing plate ll, respectively. The openingsl3 and "of each pair are horizontally aligned and the pairs of openingsare equally spaced from the central vertical plane of the housing If). Ahorizontal opening 2| is provided in the forward wall of the housingbody l6 and has its longitudinal axis on the central vertical plane ofthe housing. The opening 2| is spaced below the common plane occupied bythe longitudinal axes of the openings l9 and 20. The housing I isprovided with rearwardly projecting extensions 22 for carrying the drumsl2 and certain elements of the drive means l3. The extensions 22 aretubular members extending rearwardly through the openings 20 in theplate l1. Flanges 24 on the extensions 22 are suitably fixed to theinner surface of the plate H. The housing extensions 22 are alike oridentical and project a substantial distance rearwardly from the plateH.

The means H for mounting the attachment on the tractor T is adjustable,that is, it adapts the device for use on tractors having shafts drivenin either the right-hand direction or the lefthand direction.- Theadjustable attaching means includes an attaching member or adapter 25.The adapter 25 is a tubular element for pass ing the drive shaft of thedrive meansl3, as will be later described. A flange at the rear end ofthe adapter II is detachably secured to the housing body l by sets ofscrews 26. A similar flange on the forward end of the adapter I is del2and external shoulders on the extensions 22 to take the end thrusts aswell as the radial .loads. Inner and outer end flanges 34 and 35 areprovided on the drums 2 to define the line receiving spaces. The endportions of the lines L may be secured in openings in the drums l2 byclamp screws 36. The drums "preferably have helical faces 31 adjacentthe bases of the flanges 35 to cooperate with and locate the firsttiu'ns or convolutions of the lines L to assure the even helical reelingof the lines on the drums. The lines L are wound on the drums 2 to passupwardly from the outer sides of the drums, as illustrated in Fig. 2.

The drive means I 3 is operable to rotate the drums |2 through themedium of the clutch means H. The drive means l3 includes two like gears38 in the housing Ill. The gears 38 are spaced apart horizontally andeach gear is con-- centric relative to a drum l2 and-its relatedextension 22. In accordance with the invention the gears 38 haveinternal bearingsin the housing extensions 22. The inner portions of theopenings of the tubular extensions 22 are enlarged in diameter and thegears 38 have hearing hubs 39 received in these enlarged portions of theopenings. Suitable bushings 40 support the. hubs 33 in the housingextensions 22 for free rotation. The gear hubs 39 are of substantiallength and have extensive bearing engagement in the tubular extensions22.

Each gear 33 of the means l3 has driving cooperation with a shaft 4|.The shafts 4| extend longitudinally through the gears 38 and the relatedextensions 22 and project from the rear ends of the drums l2. The shafts4| pass through the outer portions of the housing extensions 22 withsuitable clearance and have novel-bearing tachably secured to themounting plate 21 of the tractor T by screws 28.- A boss 29 projectsforwardly from the adapter 25 and cooperates with an opening in themounting plate 21. It is important to note that the boss 23 isconcentric to the shaft receiving opening of the with the opening 2|holds the housing l0 offset horizontally from the longitudinal axisofthe tractor shaft and the opening 30. By detaching the adapter 25 fromthe tractor T and housing.

l0 and then turning it 180 the direction of this horizontal offset oreccentricity of the housing It may be reversed. This adjustment of theadapter 25 reverses the drive means l3 as will be later described.

The drums l2 are provided to operate lines L for the control andoperation of machines and tractor T. The drums l2 may be identical insize and construction. In accordance with the invention the drums l2 aretubular members and are, arranged horizontally at the rear of implementsdrawn. controlled. or carried by the the housing I0. The'above describedhousing extensions 22 extend into the tubular drums I2 to support thedrums for rotation about spaced horizontal axes. Longitudinally spacedantifriction bearings 33 rotatably support the drums l2 on the housingextensions 22. The bearings 33 cooperate with internal shoulders in thedrums stances.

engagement in the gear hubs 39. Longitudinal hearings or bushings 42 ofbabbitt or the like are provided in the gear hubs 39 to carry the shafts4|. The bushings 42 form the bearings for the shafts 4| and are ofsubstantial length to have extensive supporting cooperation with theshafts.

In accordance with the invention the bushings 42 and the shafts 4| havescrew engagement or thread engagement whereby the shafts 4| may be fedaxially relative to the gears 33 during certain phases of operation andunder certain circumthe gears 33 to the shafts 4| without causing axialshifting of the shafts. However, when the torque load on the shafts 4|is increased, as by the engagement of their clutches, thesplines 43operate to shift the shafts forwardly. This action of the splines 43 isutilized to assist in the actuation of the clutch means H as will behereinafter described.

' The drive mean l3 further includes a pinion shaft 44 extending throughthe adapter 25 and adapted to be connected with the drive shaft (notshown) of the tractor T. The shaft 44 is rotatably supported by spacedanti-friction bearing 45 in the adapter 25. The bearings 45 cooperatewith internal shoulders in the adapter 25 and with shoulders on theshaft 44 to assume the end thrusts as wellas the radial thrusts. Theforward-end of the shaft 44 projects from the The bushings 42 of thegear hubs 33 adapter-25 for connection with the shaft (not shown'ibf thetractor T. A suitable coupling p area? tion to the opening 36 and theforward boss 29 V and is, therefore, in' eccentric relation to the boss3| and the housing opening 2|. The. shaft 44 extends rearwardly from theboss 3| and its projecting rear portion carrie a pinion 41. In practicethe pinion 41 may be integral withthe shaft 44. The pinion 41 mesheswith one of the gears 38 and the two gears '38 have meshing cooperation.The drive is such that the upper portions of the meshing gears 38 turnaway from one another to reel the lines L onto the drum II. In theparticular application of the invention illustrated the drive of thetractor T may be consideredthat theshaft 44 is rotated in acounterclockwise direction viewing the shaft from its forward end. Inthis case the adapter 25 is ad J'usted or set so that the pinion 41.mesheswith event that the shaft 44 is to be driven in a clockwisedirection the adapter 25 is disconnected and is turned 180 from theposition illustrated inthe drawings and then re-connected with thehousing l8 and the tractor plate 21. Due to the acmeshing engagementwith the lefthand gear 38 as viewed in Fig. 2. The pinion 41 whenrotating 'sible for engagement. It is to be observed that the screws 55may be engaged and removed without disturbing any other parts of themechanism. Sockets 56 may enter the shafts 4| from their rear ends andthe clutch webs 54 may have pins or hubs 51 entering the sockets 56 tocen- 4 tralize the cones 5|. The clutch cones 5| are shiftable withtheir respective shafts 4| between the engaged positions where theydrive the drums end and has a shiftable or'active end. Fixtures 6 68 aresecured to the dead-end portions of the brake bands 58 and pivotallycarry laterally projecting blocks 6|. Brackets 62 are secured to the therighthand gear, as seen in Fig. 2. In the in a clockwise direction andwhen meshing with .the lefthand gear 38 rotates the two gears 38 to havetheir upper portions turnaway from one another. It will be seen that asimple setting or adjustment of the adapter adapts the mechanism foroperation by a shaftrotating in va right-hand direction or a lefthanddirection as the case may be. The attaching bolts or screws 28 and 28 ofthe adapter 25 are provided in diwith theshafts" 4|, to hold one or bothof the drums against rotation, or to allow one or both of the drumsto-rotate freely, as the operating conditions may require. The clutchand brake means l4 embodies clutches located to be immediatelyaccessible for removal, reconditioning and replacement. The means l4includes rear-. wardly projecting tubular or annular flanges 48 on theouter flanges of the drums ll. The

- flanges 48 may be integral with the drum flanges 35. The peripheral orexternal surfaces of the flanges .48 are provided'withcylindricalbraking surfaces 49 while the inner sides of the flanges Y 48 haveconical or'tapered annular clutch'surface 56.

The means l4 furtherincludes clutch cones 5| for cooperating with theclutch surfaces 50. The

mounting plate l8 and 'have slots 63 receiving the blocks 8| to anchorthe dead end portions of the brake bands 58. In accordance with theinvention the slots 63 are tangential relative to circles concentricwith the axes of rotation of energization of the brakes. The free oractive ends of the brake bands 58 carry lugs'64 engaged by or connectedwith parts of the brake control means which will later be described.

The. means l4 further includes controls for the clutch and brakemechanisms of the drums- 2.

' In accordance with the invention the shafts 4| are shiftable axiallyby novel easily operated controls to engage and disengage the clutchcones 5| from the flanges 48'. The clutch controlling mechanisms includesleeves or nuts 66 operatively connected with the shafts 4| (see Fig.3).

The shafts 4| have reduced portions projecting forwardly from thehousing body |6and the nuts 66 surround these shaft portions. The nuts66 are shiftable longitudinally with the shafts 4| but the shafts 4| andshoulders 68 on the shafts cpposing the nuts 61. Annular internal ridges69 areprovided on the inner walls of the nuts 66. .Spacedanti-frictionfbearings 10 rotatably support the nuts 68 on the shafts 4|and cooperate with the ridges 68, the nuts 61 and the shouldersperipheries of the cones 5| have suitable friction material 52 forengaging the conical clutch surfaces 50. The rear ends of the shafts 4|have radial flanges 53 and the cones 5| have webs 54 bearing forwardlyagainst the flanges 53.. Screws 55 connect the webs 54 with the flanges53 to se- 68 to connect the shafts and the nu s against relativelongitudinal movement. The nuts 66 turn or operate in forwardlyprojecting tubular -shells1| on the housing body I6. The shells 1| maybe suitably bolted to the housing body l6 and may enter the openings l9withclearance. The nuts 66 and their surrounding shells 1 havecooperating or mating threads 12 whereby turning of the nuts causeslongitudinal shifting of The threads 12 are heavy or.

66 and extends rearwardly in surrounding relation to the adjacent shell1|. A split adjustable clamp 14 engages about each cap 13 and is adapt-..ed to be set or locked in the selected positionvon the cap. Handles orlevers 15 are fixed to the the shafts 4| and the direction of the pitchof (the slots, relative to the line unreeling direction clamp 14 andextend upwardly to be conveniently accessible to the operator of thetractor T. The levers 15 may be manually shifted or operated to turn thenu s 6 and thus cause longitudinal shifting of the shafts ll andengaging or disengaging of the clutches of the drums II. The steep leador pitch of the threads I2 imparts a maximum axial movement to theshafts ll for a given manual stroke of the levers I5.

The means for controlling or operating the brakes for the drums I!include horizontal shafts I6 rot-stably carried by suitable bearings IIon the mounting plate l8. arms II are fixed to the rear ends of theshafts I6 and pro ject downwardly to be in adjacent relai ion to thelugs 64 on the brake bands 58. The arms I8 may directly bear against thelugs 54 to effect the actuation or setting -of the brakes when theshafts 15 are turned. however, pivoted links 19 connect the arms l8 withthe brake band lugs 6|. The forward end of each brake shaft 16 isprovided with a depending lever 88. A freely rotatable roller BI is carried on the lower end of each lever 80. Projecticns 82 carried by thecaps 13 cooperate with the rollers ll. In the preferred construction theprojections 82 are provided with adjustable clamps 83 engaging about thecaps I3 whereby the projections may be set 'in the correct position forengagement with the rollers 8|.

Notches 2 are provided in the edges of the projections 82 to receive therollers 8|. When a roller 8| is received in a notch N as illustrated atthe lefthand side of Fi the associated brake bandit is retained in adisengag d position where it is substantially free from the brakl isurface 49' and the clutch cone of the associated clutch is in thedisengaged position. Accordingly, the engagement of a roller II in anotch 8| provides for the free spooling of a drum l2 whereby the line Lmay freely play out from the drum. To engage a clutch cone 5| with itsclutch surface and thus provide for rotation of a drum l2andreelinginoralineI-tamanual lever is shifted to rotate a nut 68 andthus shift a shaft ll forwardly. This forward movement of the shaft llbrings the associated clutch cone 5| to the engaged position and effectsro- =tation of the drum II. In accordance with the invention theassociated or related brake means is free or substantially free when aclutch is engaged to drive a drum II. The brake means for the two drumsI! are actuated by a spring 85 connected between the two levers ll. Whenthe manual lever 15 is shifted to eflect the enno gagement of a clutchcone 5| as described above, the spring 85 swings the asociated lever Iand thus urges the brake shoe 5! to the brakin position. However, thepivotal mormtings of the brake bands 58 are such that the bands merelydrag with but little friction when the drums l2 rotate in the linespooling direction and bind or wrap about the flanges ll when the drumstend to rotate in the line imspooling direction. when a clutch cone Siis shifted into the'engaged position to drive a drum I! the actuation ofthe related brake means by the spring 85 offers litfle, if any,resistance to rotation of the drum by the power means. When it isdesired to maintain the tension on a line L the related manual leverliisshiftedtoapositionto theclutch of the drum. Swinging of the manuallover shiftstheshaftll tomovetheconeil toits disengaged position. Thisrelease of the clutch meansis accompanied bytheautomaticenersllationorsetting ofthebrakemeans. Asdescribed above, thepivotal mountings of the brake bands5l'aresmhthatthebandsautomatica1lyIn.the case illustrated,

cone5listhusbroughttotbe wrapontothesurfamlltortsistilnreelingofthelines Lwhentheleversare or conditionedbythesm'ingli.

Alinesuidingordireetingmeans liisprovidedforeachlineI-andthemeansliserve todirectthelinesastheyleavethedrums I! to give them suitablefair-leads. .Each means l5 includes a fixed post ll projecting upwardlyfrom the plate II in approximate vertical alignment with the adjacentdrum II. A pulley or sheave II is rotatably supported on the upperendofeachpostli. Thesheavesllaresupported for rotation about horizontalaxesby suitable shafts 88 fixed to the upper ends of the posts. Inaccordance with the invention the sheaves I! are pitched outwardly andforwardly relative to the longitudinal axes of the drlnns l and arelocated to most elfectively receive the lines L passing upwardly fromthe drums. The

linesLpassover thesheaves flandthenpas downwardly to pivoted or swingingsheaves US.

The means for supporting the sheaves 88 comprise like assemblies, eachincluding two complementary opposed sections 90 connected bybolts QI.The lower ends of the lower sections SI are suitably bolted to the plate18; A brace Ill may connect the upper ends shafts 91 on the wings 9|rotatably support the sheaves 89. The lines L pass downwardly from thepitched upper sheaves 81 to extend through the hrbular bosses S6 andthmengage under the sheaves I! to pass rearwardly thereirom. The sheaves l!supportedas justdcscribedareadaptedtoswingthrougharcsofsubstantlallysothattherearwardlyextendinglineslrhavea greatfreedomofmovement.

It is believed that theoperation of the power take-oft attachment'willbe readily Imderstood from the foregoing detailed description. Asdescribedahove,theadapter25maybesetorposifioned to provide for thecorrect operation of themechanismbyatractorshaftdriveneitherina'righthanddirectionoralefthanddirection.Duringoperationofthetractor'ltheshaflsllmaybecontinnouslyrotatedthroughthemedimnoftheshaftllandthepinionllandmeshinggearsfl.Whenitisdesiredtoallowaline Ltofreelyplayoutfromadrumllthepropermnualleverliisbroughttoa-positionsuchas showninthelefthandsideofl'ig.2wherethe rolierltisreceivedinthenotchll.theleverlitothisposlthnisaccompaniedbyturningofthemrtflandrearwardshiftingof theshaft ll andihclutchcmeil.clutch m. tion. The v,-..v.-. notch 84 locks or holds the associatedbrakeinaconditimwhereitoffersamtnimumof'resistancetothefreeunreelingofthelineL. ,Whmitisdesiredtoreelinalinehtheclutchleverlihshiftedtoagenerallyverticalpositlontohrrnthenutllnadheciiontofeed the shaft 4| and its clutch cone5| forwardly. Thisengagesthedrum l2 withitsshaft 4|. Upon engagement ofa clutch means as just described the torque load transmitted from a gear38 to its shaft 4| is increased and the cooperating splines 43 subjectedto this increased torque shift or advance the shaft forwardly. Thus thesplines 43 assist in the engaging of the clutch means so that the clutchmeans are partially self-energizing. When it is desired to condition adrum 12 to maintama tension on its line L the rewardly projectingtubular extension, means at;

the front of the housingfor securing the hous- 1 ing to the tractor, asubstantially horizontal 1 The attachment is compact and readily appliedto tractors and the like of various types and constructions. The drumsl2 are readily controlled by the conveniently accessible levers forgoverning the clutch and brake mechanisms of the drums. The steeplypitched threads 12 impart the necessary longitudinal movement to theshafts 4| for the control of the clutch means with a minimum movement ofthe levers 15. The splines 43 assistin the actuation of the clutch cones5| to the engaged positions and make it easy to engage theclutch means.When it becomes necessary to replace the friction material 52 on theclutch cones 5| th screws 55 are un-.- threaded and removed todisconnectthe cones 5| from their shafts 4|. The screws 55 are freely accessibleat the rear end of the attachment and the clutch cones 5| may be removedwithout interference from the other parts of the device. The gears 38and the shafts 4| are sup;

ported by a compact, simplified bearing arrangement that is dependableand long wearing.

Having described only a typical preferred form and application of myinvention, 1 do not wish to be limited or restricted to the specificdetails herein set forth, but wish to reserve to myself any variationsor modifications that may appear to those skilled in the artor fallwithin the scope bf the following claims:

Having described my invention, I claim: 1. A power take-off unit for atractorcomprising a housing, means at the front of the housing forsecuring the same to the tractor, a generally horizontal drum rotatablysupported on the rear side of the housing, a drive in the housingincluding a rotatable drive shaft extending rearwardly through the drumto the rear end of the drum, means supporting the shaft for longitudinalmovement relative to the housing and drum,

and a clutch at the rear end of the drum for transmitting rotation fromthe shaft to the drum and controlled by longitudinal movement of theshaft, the clutch including two cooperable parts, one on the drum, the,other secured to the shaft for convenient rearward detachment therefrom.

Fri

2. A power take-off .attachment for a tractor or the like comprising ahousing having a rearwardly projecting tubular extension, means at thefront of the housing for securing the housing to the tractor, asubstantially horizontal drum rotatable on the'extens'ion, a drive inthe housing including a rotatable drive shaft extending endof the'drum,means in the housingfor supporting the shaft for longitudinal movementrelative to the housing and drum, clutch means at the rear end of thedrum for transmitting rotation from the shaft to the drum and controlledby longitudinal movement of the shaft, the clutch means comprising twoparts engaged and disengaged by saidlongitudinal movement of the shaftone of said parts being on the drum, the other part being detachablysecured to theshaft,

and means for moving the shaftlongitudinally. 3. A power take-offattachment fora tractor or the like comprising a housing having areardrum rotatable on the extension; a drive in the housing including arotatable drive shaft extende ing rearwardly through the extension-tothe rear end of the drum, means for supporting theishaft forlongitudinal movement,- a clutch part on the rear end of the drum, aclutch part on theshaft cooperable with the part on the drum to transmitrotation to thedrum, and meansat the forward sideof the housing forshifting the shaft longitudinally to effect the engagement and diSEnegagement of. the clutch parts.

4. A power take-off unit of the character described comprising a,housing, a rotatable drum carried by the housing, a rotatable and longitudinally shiftable drive shaft for driving the, drum, clutch partson'the drum and shaft engageable by longitudinal shifting of the shaftto.

transmit rotation between the shaft and drum, a driven gear in thehousing, means for holding thegear against longitudinal movement, andhelical splines on the gear and shaft transmitting rotation from thegear to the shaft andoperable to urge the shaft longitudinally toengagesaid parts. I

5. A power take-off unit for a tractor comprising ahousing to be securedto the tractor and having a projecting extension, a rotatable drum onthe extension, a rotatable and axially shiftable shaft extending throughthe extension, a drive supported by the housing for rotating the shaftand supporting the shaft for longitudinal movement, clutch parts'on theshaft and drum engageable and disengageable by axial shifting of theshaft,,.-and means for shifting the'shaft axially comprising a-nut,bearing means in the nut supporting the nut on the shaft for rotationwith respect thereto and for axial'movement there with, a partstationary with the housing and surrounding the nut, mating threads onthe nut and said part in surrounding relation to said bearing means, andmanual means for turning the hut whereby the threads cause axialshifting of the shaft and nut.

6. A power take-01f unit ofthe character described comprising a housing,a rotatable drum carried by the housing, a rotatable andlongitudinallyshiftable drive shaft for driving the drum, clutch partson the drum and shaft engageable by longitudinal shifting of the shaftto transmit rotation between the shaft and drum, a driven gear in thehousing supporting the shaft for iongitudinal movement, means .forrotatably supporting the gear in the housing and for holding the gearagainst longitudinal movement, manually operable means for shifting theshaft longitudinally to engage and disengage said parts, and helicalspindles on the interior of the gear and on the shaft transmittingrotation between rearwardly threugh the extension to the rear (5 thegear and shaft and operable to assist the manually operable means inshifting the shaft to bring said parts into engagement.

7. A power take-o1! unit for a tractor comprisnig a housing, means atthe front ofthe housing for securing the same to the tractor. agenerally horizontal drum rotatably supported at the rear side of thehousing to extend rearwardly therefrom and to have its axis of rotationsubstantially parallel with the longitudinal axis of the tractor, adrive in the housing including a rotatable and longitudinally shiftableshaft for driving the drum extending rearwardly through the at the rearend of the drum for transmitting rotation from-the shaft to the drumcontrolled by longitudinal shifting of the shaft.

8. A power take-oi! attachment for a tractor comprising a housing to beattached to the tractor and having a rearwardly projecting extension, adrum rotatable on the extension, a gear in the housing having a hub, abearing secured inthe housing receiving the'hub to rotatably support thegear, a rotatable and longitudinally shlftable drive shaft extendingthrough-the hub and extension and bearing in the hub to be supv drum tothe rear end of the drum, and a clutch I HUGH ALLEN HUTCHINS.

